Thirteen ministers in Kyrgyzstan have agreed to stay on after President Kurmanbek Bakiev refused to accept their resignations, officials said.

Their move to quit came after a parliamentary resolution criticised the Cabinet.

A year on from Kyrgyzstan's popular revolution, the country has suffered widespread political instability and parliamentary wrangling.

On Saturday, President Kurmanbek Bakiev was heckled by thousands of protesters.

Only the transport and culture ministers failed to submit their resignations on Tuesday.

But Vice Premier Adakhan Madumarov told reporters: "The president did not accept the resignations. The president ordered each minister to work much harder than before... The government will remain the same."

Mr Bakiev replaced former President Askar Akayev, who was ousted in a popular uprising in March 2005 following complaints of corruption.

But Mr Bakiev has come under fire over concerns about the growing influence of criminal groups on the government, and amid complaints of widespread corruption and a sluggish economy.

In Saturday's protest rally in the capital, Bishkek, demonstrators chanted "down with thieves", demanding that President Bakiev deal with corrupt officials.

They complained that they had seen no improvement in their standard of living.

Mr Bakiev unexpectedly addressed the rally, saying the reforms he pledged would take time to be effective and that what he called irresponsible politics would not help.